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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photophysical dynamics of the efficient emission and photosensitization of [Ir(pqi)(2)(NN)](+) complexes

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Author(s):
Zanoni, Kassio P. S. [1, 2] ; Ito, Akitaka [3, 4] ; Gruner, Malte [1] ; Iha, Neyde Y. Murakami [2] ; de Camargo, Andrea S. S. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Fis Sao Carlos, Lab Espect Mat Funcionais, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Lab Fotoquim & Conversao Energia, BR-05508900 Sao Paulo, SP - Brazil
[3] Kochi Univ Technol, Sch Environm Sci & Engn, Kochi 7828502 - Japan
[4] Kochi Univ Technol, Res Ctr Mat Sci & Engn, Kochi 7828502 - Japan
Total Affiliations: 4
Document type: Journal article
Source: DALTON TRANSACTIONS; v. 47, n. 4, p. 1179-1188, JAN 28 2018.
Web of Science Citations: 7
Abstract

The photophysical dynamics of three complexes in the highly-emissive {[}Ir(pqi)(2)(NN)](+) series were investigated aiming at unique photophysical features and applications in light-emitting and singlet oxygen sensitizing research fields. Rational elucidation and Franck-Condon analyses of the observed emission spectra in nitrile solutions at 298 and 77 K reveal the true emissive nature of the lowest-lying triplet excited state (T1), consisting of a hybrid (MLCT)-M-3/LCIr(pqi) -> pqi state. Emissive deactivations from T-1 occur mainly by very intense, yellow-orange phosphorescence with high quantum yields and radiative rates. The emission nature experimentally verified is corroborated by theoretical calculations (TD-DFT), with T-1 arising from a mixing of several transitions induced by the spin-orbit coupling, majorly ascribed to (MLCT)-M-3/LCIr(pqi)-> pqi and increasing contributions of (MLCT)-M-3/LLCTIr(pqi) -> NN. The microsecond-lived emission of T-1 is rapidly quenched by molecular oxygen, with an efficient generation of singlet oxygen. Our findings show that the photophysics of {[}Ir(pqi)(2)(NN)]{[}PF6] complexes is suitable for many applications, from the active layer of electroluminescent devices to photosensitizers for photodynamic therapy and theranostics. (AU)

FAPESP's process: 15/24118-6 - Study of light emitting nanoparticles (upconverting nanophores) for biomedical and biotechnological applications
Grantee:Malte Christian Gruener
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 16/07706-4 - Nanocrystalline luminescent materials: new chemical concepts for energy conversion and sustainability
Grantee:Kassio Papi da Silva Zanoni
Support type: Scholarships in Brazil - Post-Doctorate